Crank-case-ventilating system



March 10, I931. ca. H. DAUBNER 1,795,927

CRANKQASE VENTILATING SYSTEM Filed Feb. 6, 1929 gwumtov understood torelate more particularly to' Patented Mar. 10, 1931 airs ear rice GEORGEE. DAUBNER, OF EAE'IFOBD, VTISCONSEN, ASSIGNOR TO YELLOW TRUCK & COACHMANUFACTURING COMPANY, OF PONTIAC, MICHIGAN, A CORPORATION OF MAINECRANK CASE-VENTILATING SYSTEM Application filed February 6, 1929. SerialNo. 837,926.

The object of this invention being indicated by its title, and the usualconsiderations which occasion ventilating of crankcases being wellknown, the present invention may be novel and. stationary ventilatingmeans, adapted to be secured to the crankcase of an engine,su-ch as anengine which is provided with an oil-feed pipe and also with a breatherpipe, or with equivalent pipes respectively a usual radiator coolingfan, preferred embodiments of this invention may comprise parts soshaped and combined as to render any relative advance of air past saidcrankcase effective in producing opposite pressure 29 differentials,respectively and below atmospheric, in the mentioned pipes.

It is an object of this invention to provide a novel breather can, whichmay be connected with an opening near the rear end of the V crankcase,with air-feeding neans,preferably including an excess-pressure pipecon-v necting tangentially therewith. Air conditioning means may beprovided within or associated with said can, to purlfy an ad- 30 vancinginwardly the'rethrough from a for wardly facing funnel, or the like and,V7 alter S. Cochrane having disclosed and claimed (in his Patent No.1,713,262, dated May 1%, 1929) means rendering the delivery of a blastof air into a forwardly-facing funnel (as may be done by means such asradiator cooling fan, disposed in front thereof) effective to withdrawair through an oil-feed pipe, it is an object of the present invention,preferably using a special funnel provided with a plurality of exits, toprovide a combination in which the mentioned breather-can organizationand features of the mentioned Cochrane invention are conj ointlyemployed.

Other objects of this invention may be best appreciated by the followingdescription of an illustrative embodiment thereof, taken in connectionwith the appended claims and the In the drawings:

Figure 1 is a front elevational view, with parts broken away.

Figure 2 is a side elevational view, taken substantially as indicated bythe arrow 2 of Figure 1, with parts differently broken away.

Figure 3 is a top plan view, taken substans tiaily as indicated by thearrow 8 Figure 2,

but with parts differently broken away. J

As to the details of that specific embodiment of the present inventionwhich has been chosen for the purpose of illustration, an engine,partially shown at 10, and its crankcase 11, radiator 12, and a fan 13,driven by said engine, may be of any usual or preferred type; and saidcrankcase is shown as provided, near its rear end, with an air inletopening 14. This inlet opening may advantageously be spaced at aconsiderable longitudinal distance from an additional or outletopening15; and the present invention should be understood to relate moreparticularly to novel means justifying reference to a forwardly-openingpipe 16, shown as inwardly connected with'the former opening, as anexcess-pressure pipe,-the means employed to create a positive pressureat the opening 14 being preferably so combined with some suitable meansfor withdrawal of air through the opening 15 as to justify designationof pipe 17, connected with the last-mentioned opening, as areduced-pressure pipe,-the' combined effect of the pressuredifferentials referred to being an improved circulation of air throughthe crankcase 11, or its equivalent. The mentioned patent of Cochranesug" gests the equipment of an oil-feed pipe 18 (whichmay be integralwith the reducedpressure pipe 17 and may include an interior baffle 19,defining an air-exit throat 20, which is shown as extending to anannular )assage element 21) with an aspirating unit,the' latterpreferably includinga suitable funnel element and an inner pipe 23,adapted to cooperate with the mentioned annular element to produce aVenturi effect. A combined outflow pipe 24 may be carried, in a knownmanner, to a carburetor, not shown; or, it may be so terminated as toproduce an additional suction effect, as suggested in Figure 1.

The novel forwardly-facing funnel 25, with which the pipe 23 is shown ascommunicating, may receive and feed into pipe 23 a suitable blast of air(whether or not the latter is driven past the mentioned radiator and/orengine crankcase by means such as the fan 13) and, to obviate aduplication of funnels, the funnel 25 may serve also in feeding air intothe forward and open end of the excess-pressure pipe 16 or itsequivalent. For this purpose, the funnel 25 is shown as provided with aplurality of blast exit openings 25, 25, communicating respectively withpipes 23 and 16,the lower of these being shown as the larger; and, inorder to produce an air-whorling and/ or other conditioning effectwithin a breather can 28, in case such a can is interposed between theexcess-pressure pipe 16 and the air inlet opening l t, the pipe 16 maybe tangentially connected with said can; and said can may be providedwith dust-removing means, of the general character suggested in Figures2 and 3. Aside from a dust-separating effect, the spiral movementimparted to the incoming air is favorable to its circulation.

In the figures last referred to, a cylindrical screen 29 is shown asdisposed concentrically within the said can; and said can may beprovided with additional dust-eliminating means such as a vertical slot30, protected by a tangential lip 31, the parts here referred to beingmerely illustrative of means optionally employed to prevent avoidableadvance of dust through the inlet opening 14, or its equivalent.

In ordinary operation, it will be understood that whenever the startingof the engine occasions rotation of the fan 13 (or whenever bodilyadvance of a vehicle equipped in the described manner raises asufficient blast of air by the action of funnel 255, or its equiva lent)movements of air inward through the opening 14 and outward through anyopening 15 assure an adequate ventilation of the crankcase element 11,or its equivalent, this result being reliably obtained even at lowengine speeds and without the employment of any relatively moving partsor any appreciable waste of power.

Although the foregoing description includes details of but a singleembodiment of the present invention, it should be understood, not onlythat various features thereof may be independently used but also, thatnumerous modifications might easily be devised,all within the scope ofsaid invention, as the latter is indicated above and in the followingclaims.

I claim: 7

1. In a system of ventilation for a crankcase provided with a pluralityof openings; :1 blast-receiving funnel; and means, connected with saidfunnel, for producing opposite pressure eifects through the saidopenings, to advance air through said crankcase.

2. A combination as defined in claim 1, in which a radiator-cooling fanis disposed partially in front of said funnel.

3. A combination as defined in claim 1, in which said pressure-producingmeans includes an aspirator organization, which is connected with areduced-pressure pipe communicating with one of said openings, andincludes also an excess-pressure pipe which communicates with another ofsaid openings.

A. A combination as defined in claim 1 in which said pressure-producingmeans includes an aspirator organization which is connected with areduced-pressure pipe communicating with one of said openings, andincludes also an excess-pressure pipe which communicates, by way of anair-conditioning breather can, with another of said openings.

5. In means for advancing air through a breather can opening into acrankcase of an engine which drives a cooling fan: a pipe communicatingwith said can; and means rendering rotation of said fan effective toadvance air through said pipe and thence inwardly through. said can,said last-mentioned means comprising a forwardly-facing funnel which isconnected also with means for withdrawing air from said crankcase.

6. For use in a combination of the general characted described: anelement to be ventilated through openings provided therein, ablast-raising element provided with a plurality of blast-exit openings;and separate means, respectively interposed between said exit openingsand the respective openings which are provided in the element tobeventilated, rendering the resultant blast effective to produce oppositemovements of air through said last-mentioned openings.

In testimony whereof I afiiX my signature.

GEORGE H. DAUBNER.

